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Phylogenetic relationships of partial gp41/Nef protein sequences from SIVcpz and HIV-1. See legend of Fig. 5 for details and methods. The additional sequences (with GenBank accession numbers) are SIVcpz strains GAB2 (unpublished), DRC1 (AY542959), TAN2 (AY181991), TAN3 (AY181992), and TAN5 (AY181993).
